Scoliosis cause lump in breast??

I am 21 years old and recently my doctor found a lump in my breast. She said it doesn't feel like a typical breast cancer lump but wants me to get it checked out just to be safe. She had mentioned that it may even be the way my chest wall is because it is long and flat and you really have to push to feel it. Anyway I was in shock and forgot to mention that I have scoliosis and one side of my back sticks out farther then the other so I guess it would make sense that one side of my chest would stick out farther too. I was just wondering if this has ever happened to someone else just so I can get a little more reassurance that everything will be ok.

Are you thin and small breasted?
Because i am, and I can feel.... well, chest ribs, or my chest wall or something, if I press real hard on my boobs. It scared me once because i thought it was a lump, but then I felt one on the other side too and realized it was part of my bone structure.

If the scoliosis makes one side of your chest stick out more, I can totally see how that could be confused with a lump.
It's gotta be something like that, because it's just too rare for girls your age to get breast cancer. I mean, I've heard of it, but. It's sooo super-rare.

I am thin about 5'6" and 120 pounds but I am large chested (34D) but I have had a child so they are not as full as they used to be. I am really set on it just being my ribs because I can feel my ribs under my other breast as well I just have to push a lot harder. I think it is just more prominent on my left side.